Olivia Newton-John was diagnosed with cancer for a third time past year and cancelled her tour to complete a short course of radiation therapy.
"My husband's always there, and he's always there to support me, and I believe I will win over it and that's my goal", she told the Seven Network show.
She was first diagnosed with breast cancer in 1992 which she overcame, in the process becoming a fierce advocate for breast cancer screening. In 2013, cancer was found in her shoulder.
Among the stars who spoke about Newton-John on 7's Sunday Night programme were Sir Barry Gibb and Sir Cliff Richard.
In the emotional interview on Sunday Night, she said: "I'm one of millions in this fight". I'd be lying if I said I never go there.
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"There are moments. I'm human". If I allowed myself to go there, I could easily create that big fear.
Olivia is "treating it naturally and doing really well".
On a drive to visit her sister Rona just before she died of brain cancer, Olivia was in a vehicle accident.
Last year, she was forced to cancel her tour after learning she had "breast cancer that [had] metastasised to the sacrum".
Olivia's husband of ten years, John Easterling, is founder of the Amazon Herb Company, and grows cannabis for her at their ranch in Santa Barbara, California.
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After beating the disease, she became an advocate for breast cancer research and treatment, opening the Olivia Newton-John Cancer Wellness and Research Centre in Melbourne, Australia.
Newton-John chose to keep the cancer diagnosis private at the time.
That being said, she undergoes radiation treatments but also follows a no-sugar diet and uses cannabis oil for the pain. I see as part of my mission.
'[My husband] makes me tinctures and they really help with the pain, they help with sleep, so I am very lucky I live in a state where [cannabis] is legal and also that I have a husband that's a plant medicine man. I have an incredible career. I have nothing to complain about, ' the Grease star said.
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